It's cool they released it, Raven is apparently totally rad. But still, why not criticize where they host it? GitHub is the better choice (for me at least).
Because criticizing a no-strings-attached gift to the public is obviously rude? "Don't look a gift horse in the mouth" is not some subtle gotcha of social interaction. It's basic politeness.
If their choice of hosting is so terrible, you're entirely able to upload it wherever you please.
Sounds funny and like a direct translation from German: Einem geschenkten Gaul schaut man nicht ins Maul.
Is Dutch. German rhymes much better though!
Don't be that guy.